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Displays with local dimming system are the new frontier in Liquid Crystal devices, performing an amazing contrast ratio and the darkest black ever.
Do you remember when LCD televisions were looked down as the “poor relatives” around image reproduction, crushed by plasma models and by the good old cathode ray tube
Those times are technologically far away, even though not so many years have gone by. Liquid Crystal Technology has definitely filled the gap that was separating it from its competitors and at the moment it seems to have the weapon of choice to be the winner in the war on quality.
The ace up the sleeve is called “Local Dimming” and it works with a LED backlight.
It makes look old and tired not only the plasma devices (being the Crt TV out of the scene) but also the LCD displays begin to look not so fit anymore...
When they appeared in the television market (before, they were mostly used in informatics), Lcd models had clear limitations regarding the contrast ratio, the black level, the chromatic scale, the visual angle and much more.
They also immediately revealed their great advantages, especially around electricity consumption and reliability. As a matter of fact, they don't show the well known and feared phenomenon of the Temporary Image Retention, which plasma often suffer from.
All problems have been by now faced and reduced, except for the first one.
The contrast ratio and the black level have been improved, but the material hindrance of the backlight via the panel bulbs made it impossible to attain the plasma level, since plasma went itself through a great optimization.
That's when the new LED back-light system comes into the play. Due to the onoff device, the dynamic contrast ratio in LCD televisions got a real boost, rising from a 50.0001 (calculated on the best conventional backlight models on the market) to a ratio that was considered impossible until a short time ago, coming close to one milllion to one.
And it is not just bragging about numbers, because such a high dynamic contrast means a black level and a chromatic adherence absolutely extraordinary for liquid crystal devices.
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